RxCommand<TParam, TResult> constructor
RxCommand<TParam, TResult>(Subject<CommandResult<TResult>> _commandResultsSubject, Observable<bool> canExecuteRestriction, bool _emitLastResult, bool _resultSubjectIsBehaviourSubject)
Implementation
RxCommand(this._commandResultsSubject, Observable<bool> canExecuteRestriction, this._emitLastResult, this._resultSubjectIsBehaviourSubject)
: super(_commandResultsSubject) {
_resultsSubject = _resultSubjectIsBehaviourSubject ? new BehaviorSubject<TResult>() : new PublishSubject<TResult>();
this.where((x) => x.hasError).listen((x) => _thrownExceptionsSubject.add(x.error));
this.listen((x) => _isExecutingSubject.add(x.isExecuting));
final _canExecuteParam = canExecuteRestriction == null
? new Observable<bool>.just(true)
: canExecuteRestriction.handleError((error) {
if (error is Exception) {
_thrownExceptionsSubject.add(error);
}
}).distinct();
_canExecuteParam.listen((canExecute) {
_canExecute = canExecute && (!_isRunning);
_executionLocked = !canExecute;
_canExecuteSubject.add(_canExecute);
});
}